Broken Music Module?

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Por Daffy

Rookie (29)

imagem de Daffy

02-12-2008, 10:09

I haven't bought the resistors yet. Will go to Coditronic next thursday. Will let you all know if it was the right solution for the problem

Por Repair-Bas

Paragon (1158)

imagem de Repair-Bas

07-12-2008, 17:37

No news, but I think it is working.
beacuse Daffie is to busy with playing it, so we do not get any news

Por Daffy

Rookie (29)

imagem de Daffy

08-12-2008, 07:33

it is nog working yet because i can't seem to get hold of the 22 ohm resistors. Got my Turbo-r drivebelt from Bas last week so i'm too busy playing with my Turbo-R anyway... I'll let you all know when i fixed the thing...

Por Repair-Bas

Paragon (1158)

imagem de Repair-Bas

08-12-2008, 13:27

I have them in stock
If you need them please sent me a private mail with your adress

Por Daffy

Rookie (29)

imagem de Daffy

09-12-2008, 09:52

mail sent...

Por Daffy

Rookie (29)

imagem de Daffy

11-12-2008, 18:27

I just replaced the R1 and R2 resistors but there is still no sound coming from the music module? Any other suggestions?

Por Repair-Bas

Paragon (1158)

imagem de Repair-Bas

11-12-2008, 19:16

On what type msx you use the MM?

maybe the -12V is not working on the computer

Por Daffy

Rookie (29)

imagem de Daffy

11-12-2008, 20:49

I've tried it on my turbo-R, 700P and 8250 with the same result on every computer...

Por RetroTechie

Paragon (1563)

imagem de RetroTechie

12-12-2008, 02:12

If I read the schematic correctly, there's a separate DAC in the Music Module, with which you can produce sound simply by writing sample bytes to some I/O port? I'm not sure what I/O port exactly, maybe someone else knows which, or what software you can use to do this? The important thing is: you might be able to produce sound with that even if MSX-Audio chip is broken.

Then there's lots of mixers, amplifiers & click/pop noise prevention circuitry between MSX-Audio chip, the DAC it uses (Y3014), the separate DAC mentioned above, and the point(s) where audio goes to the outside world. If one of those parts is broken, you might be able to 'probe' for an audio signal somewhere in between? You could look at the schematic for good points in the circuit to find audio signals *before* they pass through one of those mixers / filters / amplifiers. I'd surely try and make sure to determine if it's the MSX-Audio chip itself, or some other part that's gone. If MSX-Audio chip gone: shit happens. But if some other part: probably a $0.02 fix.

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